Construction and Operating Experiences of the RHKW Linz (Austria)

Strabag Energy Technologies provides fluidised bed boiler solutions for biomass, waste and other residue derived fuels with steam capacities from 30 to 160 t/h. The combustion system has been developed to allow maximum flexibility in the range of fuels. Beside environmentally sound combustion with low emissions, maximum boiler efficiency is the main target.

In this paper the operating experience of a new installed RDF-fired plant with high fuel flexibility in Linz/Austria is presented.

Residue derived fuels have a high potential to substitute fossil fuels such as oil, gas and coal in power plants units close to large cities, especially when district heating systems are available. Another driving force is the Kyoto protocol for CO2 reduction resulting in state support for green power electricity substitution of imported primary energy and multi-fuel concepts together with RDF.

Additionally, to the conventional grate based waste to energy solutions combustion of RDF in fluidised beds gains more and more importance. This is driven by the fact that this technology is capable for a high degree in fuel flexibility combined with low emissions. Further, fuels with very high water content such as sewage sludge can be disposed easily.

In Linz Strabag Energy Technologies (SET) has erected a new 72 MWth fired RDF fluidised bed boiler. The boiler is designed as a SETCIA bubbling fluidized bed applying multi-staged combustion technology. The fuel is gasified in the bed to yield combustible gases (mainly H2 and CO) which are then combusted stepwise in the post combustion chamber.

The substochiometric bed operation allows a bed temperature control in the range between 600 °C – 900 °C. Therefore, fuels with low ash melting temperature can be safely combusted and the alkali release to the flue gases is reduced. The stepwise combustion of the yielded gases reduces the formation of NOx as well as the formation of melted or softened ashes.

Copyright: © TK Verlag - Fachverlag für Kreislaufwirtschaft
Quelle: Waste Management, Volume 3 (Oktober 2012)
Seiten: 8
Preis inkl. MwSt.: € 0,00
Autor: Dr. techn. Dipl.-Ing. Philipp Kolbitsch
Dipl.-Ing. Florian Madl
Ing. Bruno Ronald Wachter

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Physikalische und biologische
Aufbereitungs- und Behandlungs-
technologien, TU Braunschweig